JP2016528537A - Pixel drive current extraction apparatus and pixel drive current extraction method - Google Patents
Pixel drive current extraction apparatus and pixel drive current extraction method Download PDFInfo
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Abstract
画素駆動電流抽出装置及び画素駆動電流抽出方法を提供する。画素駆動電流抽出装置は、各色の画素駆動回路にそれぞれ対応する駆動電流抽出回路を備える。各駆動電流抽出回路は、画素駆動回路に接続され、画素駆動回路の駆動電流を増幅して電圧信号に変換する駆動電流増幅変換ユニットと、駆動電流増幅変換ユニットに接続され、電圧信号により画素駆動電流を計算する駆動電流計算ユニットと、を備える。各色の画素駆動回路に対応する駆動電流抽出回路において、駆動電流増幅変換ユニットの増幅倍数は、該色の画素駆動電流の大きさと反比例する。歪みがない前提で、各色画素の駆動電流を均一に抽出して合理的に増幅し、後続の信号処理に良好のデータサポートを提供した。A pixel driving current extracting device and a pixel driving current extracting method are provided. The pixel drive current extraction device includes a drive current extraction circuit corresponding to each color pixel drive circuit. Each drive current extraction circuit is connected to the pixel drive circuit, a drive current amplification conversion unit that amplifies the drive current of the pixel drive circuit and converts it into a voltage signal, and a drive current amplification conversion unit that is connected to the drive current amplification conversion unit and drives the pixel by the voltage signal A drive current calculation unit for calculating a current. In the drive current extraction circuit corresponding to the pixel drive circuit of each color, the amplification factor of the drive current amplification conversion unit is inversely proportional to the magnitude of the pixel drive current of the color. On the premise of no distortion, the drive current of each color pixel was uniformly extracted and rationally amplified to provide good data support for subsequent signal processing.
Description
本発明は、有機発光ディスプレイの技術分野に関し、特に、画素駆動電流抽出装置及び画素駆動電流抽出方法に関する。 The present invention relates to a technical field of an organic light emitting display, and more particularly, to a pixel driving current extracting device and a pixel driving current extracting method.
従来の液晶パネルに対して、アクティブマトリクス式有機発光ダイオードＡＭＯＬＥＤ（Ａｃｔｉｖｅ Ｍａｔｒｉｘ／Ｏｒｇａｎｉｃ Ｌｉｇｈｔ Ｅｍｉｔｔｉｎｇ Ｄｉｏｄｅ）ディスプレイパネルは、応答速度がさらに速く、コントラストがさらに高く、視野角がさらに広い等の特徴を有するため、ＡＭＯＬＥＤがディスプレイ技術開発業者にますます広く注目されている。 Compared to conventional liquid crystal panels, active matrix organic light emitting diodes AMOLED (Active Matrix / Organic Light Emitting Diode) display panels have features such as faster response, higher contrast, and wider viewing angle. AMOLED is gaining more and more attention from display technology developers.
ＡＭＯＬＥＤディスプレイパネルは、駆動薄膜トランジスタ（Ｔｈｉｎ Ｆｉｌｍ Ｔｒａｎｓｉｓｔｏｒ、ＴＦＴ）が飽和状態で生成する電流に駆動されるため、発光することができるようになり、同じグレースケール電圧が入力される場合、異なる臨界電圧が異なる駆動電流を生成するため、電流が不一致になり、スクリーン表示が不均一になってしまい。上述した不一致性に関する情報を得るために、各画素の駆動電流を抽出し、各画素の駆動電流を得た後、各画素の駆動電圧を補正して、スクリーン表示の不均一を改善することができる。 The AMOLED display panel is driven by a current generated by a driving thin film transistor (TFT) in a saturated state, so that the AMOLED display panel can emit light. When the same gray scale voltage is input, different critical voltages are generated. Since different drive currents are generated, the currents are inconsistent and the screen display is non-uniform. In order to obtain the information on the inconsistency described above, the drive current of each pixel is extracted, and after obtaining the drive current of each pixel, the drive voltage of each pixel is corrected to improve the non-uniformity of the screen display. it can.
ＡＭＯＬＥＤディスプレイパネルの赤、緑、青との三色画素の発光効率が異なるため、各色画素内の駆動電流の大きさも異なり、これによって、駆動電流を抽出する時、同じ増幅倍数を有する演算増幅器を用いると、各色の画素の駆動電流が蓄積容量に対する充電時間が不一致になり、例えば、大きい駆動電流が必要する充電時間は短いが、小さい駆動電流が必要する充電時間は長いため、最後で得られるデータが不均一になる。 Since the light emission efficiency of the three color pixels of red, green, and blue of the AMOLED display panel is different, the magnitude of the drive current in each color pixel is also different, so that when extracting the drive current, an operational amplifier having the same amplification factor is used. If used, the charging current for the pixels of each color will not match the charging time for the storage capacitor. For example, the charging time required for a large driving current is short, but the charging time required for a small driving current is long, so it is obtained at the end. Data is uneven.
本発明が解決する技術の問題は、従来技術の欠点に対して、均一なデータを得ることができる画素駆動電流抽出装置及び画素駆動電流抽出方法を提供し、後続の信号処理に良好のデータサポートを提供した。 The problem of the technology to be solved by the present invention is to provide a pixel driving current extracting device and a pixel driving current extracting method capable of obtaining uniform data with respect to the drawbacks of the prior art, and to provide good data support for subsequent signal processing. Provided.
本発明の一方面は、画素駆動電流抽出装置を提供し、当該画素駆動電流抽出装置は、各色の画素駆動回路にそれぞれ対応する駆動電流抽出回路を備え、各駆動電流抽出回路は、
画素駆動回路に接続され、画素駆動回路の駆動電流を増幅して電圧信号に変換する駆動電流増幅変換ユニットと、
前記駆動電流増幅変換ユニットに接続され、前記電圧信号によって画素駆動電流を計算する駆動電流計算ユニットと、を備え、
各色の画素駆動回路に対応する駆動電流抽出回路における駆動電流増幅変換ユニットの増幅倍数は、該色の画素駆動電流の大きさと反比例する。
One aspect of the present invention provides a pixel drive current extraction device, the pixel drive current extraction device includes a drive current extraction circuit corresponding to each color pixel drive circuit, and each drive current extraction circuit includes:
A drive current amplification conversion unit connected to the pixel drive circuit and amplifying the drive current of the pixel drive circuit and converting it to a voltage signal;
A drive current calculation unit connected to the drive current amplification conversion unit and calculating a pixel drive current according to the voltage signal;
The amplification factor of the drive current amplification conversion unit in the drive current extraction circuit corresponding to the pixel drive circuit for each color is inversely proportional to the magnitude of the pixel drive current for that color.
選択的には、前記駆動電流増幅変換ユニットは、第１の増幅器及び第１のコンデンサーを備え、
前記第１の増幅器は、第１の入力端が第１のコンデンサーの一端と、該抽出回路に対応する画素駆動回路とに接続され、第２の入力端が参照電圧に接続され、
前記第１の増幅器の出力端が第１のコンデンサーの他端及び駆動電流計算ユニットにそれぞれ接続され、
各色の画素駆動回路に対応する駆動電流抽出回路において、第１の増幅器の増幅倍数は、該色の画素駆動電流の大きさと反比例する。
Optionally, the drive current amplification conversion unit includes a first amplifier and a first capacitor,
The first amplifier has a first input terminal connected to one end of a first capacitor and a pixel driving circuit corresponding to the extraction circuit, a second input terminal connected to a reference voltage,
The output terminal of the first amplifier is connected to the other end of the first capacitor and the drive current calculation unit, respectively.
In the drive current extraction circuit corresponding to the pixel drive circuit for each color, the amplification factor of the first amplifier is inversely proportional to the magnitude of the pixel drive current for the color.
選択的には、前記駆動電流増幅変換ユニットは、前記第１のコンデンサーに並列に接続される第１のスイッチをさらに備える。 Optionally, the drive current amplification conversion unit further includes a first switch connected in parallel to the first capacitor.
選択的には、前記画素駆動電流抽出装置は、赤、緑、青との三色の画素駆動回路にそれぞれ対応する駆動電流抽出回路を有する。前記赤、緑、青との三色の画素駆動回路の駆動電流抽出回路では、緑色の画素駆動回路に対応する駆動電流抽出回路において、第１の増幅器の増幅倍数が最も大きく、青色の画素駆動回路に対応する駆動電流抽出回路において、第１の増幅器の増幅倍数が最も小さい。 Optionally, the pixel drive current extraction device includes drive current extraction circuits corresponding to pixel drive circuits of three colors of red, green, and blue, respectively. In the drive current extraction circuit of the three-color pixel drive circuit of red, green, and blue, in the drive current extraction circuit corresponding to the green pixel drive circuit, the amplification factor of the first amplifier is the largest, and the blue pixel drive In the drive current extraction circuit corresponding to the circuit, the amplification factor of the first amplifier is the smallest.
選択的には、前記駆動電流計算ユニットは、前記電圧信号を分圧してから差分及び増幅演算をして画素駆動電流を得るものである。 Optionally, the drive current calculation unit divides the voltage signal and then performs a difference and amplification operation to obtain a pixel drive current.
選択的には、前記駆動電流抽出装置は、前記第１のコンデンサーに並列に接続される第１のスイッチをさらに備え、
前記駆動電流計算ユニットは、第２の増幅器、第２のスイッチ、第３のスイッチ、第２のコンデンサー及び第３のコンデンサーを備え、
前記第１の増幅器の出力端は、前記第２のスイッチの一端及び第３のスイッチの一端にそれぞれ接続され、
前記第２のスイッチの他端は、第２のコンデンサーの一端及び第２の増幅器の第１の入力端にそれぞれ接続され、前記第２のコンデンサーの他端が接地され、
前記第３のスイッチの他端は、第３のコンデンサーの一端及び第２の増幅器の第２の入力端にそれぞれ接続され、前記第３のコンデンサーの他端が接地される。
Optionally, the drive current extraction device further comprises a first switch connected in parallel to the first capacitor,
The drive current calculation unit includes a second amplifier, a second switch, a third switch, a second capacitor, and a third capacitor,
The output terminal of the first amplifier is connected to one end of the second switch and one end of a third switch, respectively.
The other end of the second switch is connected to one end of a second capacitor and a first input end of a second amplifier, and the other end of the second capacitor is grounded.
The other end of the third switch is connected to one end of the third capacitor and the second input end of the second amplifier, and the other end of the third capacitor is grounded.
選択的には、前記第１のスイッチ、第２のスイッチ及び第３のスイッチは、いずれもスイッチトランジスタである。 Optionally, the first switch, the second switch, and the third switch are all switch transistors.
選択的には、前記第１のスイッチ、第２のスイッチ及び第３のスイッチは、タイミング制御装置にそれぞれ接続され、前記タイミング制御装置は、第１のスイッチ、第２のスイッチ及び第３のスイッチの開閉タイミングをそれぞれ制御する。 Optionally, the first switch, the second switch, and the third switch are connected to a timing control device, respectively, and the timing control device includes the first switch, the second switch, and the third switch. The opening / closing timing of each is controlled.
選択的には、前記駆動電流計算ユニットは、前記第２の増幅器の出力端に接続され、アナログ信号をデジタル信号に変換する差分アナログ−デジタル変換器をさらに備える。 Optionally, the driving current calculation unit further includes a differential analog-to-digital converter connected to the output terminal of the second amplifier and converting an analog signal into a digital signal.
選択的には、前記第１の増幅器は演算増幅器であって、入力される電流を電圧に変換するものであり、前記第２の増幅器は、全差分演算増幅器であって、第２のコンデンサーと第３のコンデンサーとの電圧差の値を計算して増幅するものである。 Alternatively, the first amplifier is an operational amplifier that converts an input current into a voltage, and the second amplifier is a total difference operational amplifier, and a second capacitor The value of the voltage difference with the third capacitor is calculated and amplified.
本発明の他の方面によれば、上述したいずれの画素駆動電流抽出装置に用いられる画素駆動電流抽出方法をさらに提供する。 According to another aspect of the present invention, there is further provided a pixel drive current extraction method used in any of the pixel drive current extraction devices described above.
画素駆動電流抽出方法であって、当該画素駆動電流抽出方法は、
駆動電流を抽出して、画素駆動回路の駆動電流を増幅して電圧信号に変換するステップと、
駆動電流を計算して、前記電圧信号を分圧してから差分及び増幅演算をして画素駆動電流を得るステップと、を備え、
各色の画素駆動電流に対する増幅倍数は、該色の画素駆動電流の大きさと反比例する。
A pixel drive current extraction method, wherein the pixel drive current extraction method is:
Extracting the drive current, amplifying the drive current of the pixel drive circuit and converting it to a voltage signal;
Calculating a drive current, dividing the voltage signal, and performing a difference and amplification operation to obtain a pixel drive current, and
The amplification factor for the pixel driving current of each color is inversely proportional to the magnitude of the pixel driving current of that color.
選択的には、上述した画素駆動電流抽出方法は、
第１のスイッチ、第２のスイッチ及び第３のスイッチを導通して、第１の増幅器の出力端の電圧を参照電圧にリセットするステップＳ１と、
第１のスイッチを切断し、画素駆動回路から流入される電流が第１のコンデンサーを充電するステップＳ２と、
第２のスイッチ及び第３のスイッチを順に切断して、第２のコンデンサー及び第３のコンデンサーの電圧値を得て、第２の増幅器によって第２のコンデンサーと第３のコンデンサーとの電圧差の値を計算して増幅するステップＳ３と、をさらに備える。
Alternatively, the pixel drive current extraction method described above may include:
Conducting the first switch, the second switch, and the third switch, and resetting the voltage at the output terminal of the first amplifier to the reference voltage;
Cutting off the first switch and charging the first capacitor with a current flowing from the pixel driving circuit;
The second switch and the third switch are cut in order to obtain the voltage values of the second capacitor and the third capacitor, and the voltage difference between the second capacitor and the third capacitor is obtained by the second amplifier. Step S3 is further provided for calculating and amplifying the value.
選択的には、前記ステップＳ３の後に、
増幅された電圧差の値を差分アナログ−デジタル変換器に入力して、デジタル信号を得るステップＳ４をさらに備える。
Optionally, after step S3,
Step S4 is further provided to input the amplified voltage difference value to the differential analog-to-digital converter to obtain a digital signal.
本発明実施例で提供される画素駆動電流抽出装置は、各色の画素駆動電流の大きさに従って、発光効率が高い画素、即ち、小さい駆動電流に大きい増幅倍数を設置し、発光効率が低い画素、即ち、大きい駆動電流に小さい増幅倍数を設置することにより、歪みがない前提で、各色の画素の駆動電流を均一に抽出して合理的に増幅し、後続の信号処理に良好のデータサポートを提供したという有益な効果が得られる。 The pixel drive current extraction device provided in the embodiment of the present invention is a pixel having a high light emission efficiency according to the magnitude of the pixel drive current of each color, that is, a pixel having a low light emission efficiency by installing a large amplification factor for a small drive current In other words, by installing a small amplification factor for a large drive current, the drive current of each color pixel is uniformly extracted and rationally amplified on the premise of no distortion, providing good data support for subsequent signal processing A beneficial effect is achieved.
以下、図面及び実施例を組み合わせて、本発明の具体的な実施形態をさらに説明する。下記実施例は、本発明の保護範囲を制限するものではなく、本発明の原理を説明するものに過ぎない。 Hereinafter, specific embodiments of the present invention will be further described in combination with the drawings and examples. The following examples do not limit the scope of protection of the present invention, but merely illustrate the principles of the invention.
図１に示すように、本例示的な実施例は、まず、画素駆動電流抽出装置を提供し、当該画素駆動電流抽出装置は、各色の画素駆動回路にそれぞれ対応する駆動電流抽出回路を備え、駆動電流抽出回路は、主に、駆動電流増幅変換ユニットと、駆動電流増幅変換ユニットに接続される駆動電流計算ユニットとを備え、駆動電流増幅変換ユニットは、画素駆動回路に接続され、画素駆動回路の駆動電流を増幅して電圧信号に変換するものであり、駆動電流計算ユニットは、駆動電流増幅変換ユニットに接続され、電圧信号によって画素駆動電流を計算するものであり、各色の画素駆動回路に対応する駆動電流抽出回路において、駆動電流増幅変換ユニットの増幅倍数は、該色の画素の駆動電流の大きさと反比例する。 As shown in FIG. 1, the exemplary embodiment first provides a pixel driving current extracting device, and the pixel driving current extracting device includes a driving current extracting circuit corresponding to each color pixel driving circuit, The drive current extraction circuit mainly includes a drive current amplification conversion unit and a drive current calculation unit connected to the drive current amplification conversion unit. The drive current amplification conversion unit is connected to the pixel drive circuit, and the pixel drive circuit The drive current calculation unit is connected to the drive current amplification conversion unit and calculates the pixel drive current based on the voltage signal, and the pixel drive circuit of each color is connected to the drive current amplification conversion unit. In the corresponding drive current extraction circuit, the amplification factor of the drive current amplification conversion unit is inversely proportional to the magnitude of the drive current of the pixel of the color.
本実施例では、各色の画素は、赤色画素（Ｒ）、緑色画素（Ｇ）及び青色画素（Ｂ）であり、三色画素の駆動電流ＩＲ、ＩＧ、ＩＢは、駆動電流増幅変換ユニットにそれぞれ入力され、駆動電流増幅変換ユニットは、入力された電流信号を電圧に変換して駆動電流計算ユニットに出力して必要な駆動電流値を得る。 In this embodiment, the pixels of each color are a red pixel (R), a green pixel (G), and a blue pixel (B), and the driving currents I R , I G , and I B of the three-color pixels are converted to driving current amplification conversion. The drive current amplification conversion unit converts the input current signal into a voltage and outputs it to the drive current calculation unit to obtain a required drive current value.
図２に示すように、本実施例では、駆動電流増幅変換ユニットは、主に、第１の増幅器１及び第１のコンデンサーＣ１を有し、第１の増幅器１は、演算増幅器であってもよく、入力された電流を電圧に変換して増幅するものであり、第１の増幅器１は、第１の入力端が第１のコンデンサーＣ１の一端と、該抽出回路に対応する画素駆動回路とにそれぞれ接続され、第２の入力端が参照電圧Ｖｒｅｆに接続され、画素駆動回路が各色の画素に駆動電流を提供するものであり、第１の増幅器１の出力端が第１のコンデンサーＣ１の他端及び駆動電流計算ユニットにそれぞれ接続される。本実施例では、各色の画素の駆動電流を均一に抽出するように、各色の画素駆動回路に対応する駆動電流抽出回路において、第１の増幅器１の増幅倍数は、該色の画素駆動電流の大きさと反比例する。例えば、緑色画素の発光効率が最も高いため、緑色画素の駆動電流が最も小さく、青色画素の発光効率が最も低いため、青色画素の駆動電流が最も大きい。そのため、緑色画素の駆動回路に対応する駆動電流抽出回路において、第１の増幅器１の増幅倍数が最も大きく、赤色画素の駆動回路に対応する駆動電流抽出回路において、第１の増幅器１の増幅倍数がそれに次いで、青色画素の駆動回路に対応する駆動電流抽出回路において、第１の増幅器１の増幅倍数が最も小さい。このように、大きい駆動電流が必要する充電時間は短くなり、小さい駆動電流が必要する充電時間は適当に長くなり、最終に各色画素の駆動電流が第１のコンデンサーＣ１に対する充電時間をほぼ同じようになることにより、最後に得られるデータが均一になる。 As shown in FIG. 2, in this embodiment, the drive current amplification conversion unit mainly includes a first amplifier 1 and a first capacitor C1, and the first amplifier 1 is an operational amplifier. Often, the first amplifier 1 converts the input current into a voltage and amplifies it. The first input terminal of the first amplifier 1 is one end of the first capacitor C1, and a pixel driving circuit corresponding to the extraction circuit. , The second input terminal is connected to the reference voltage Vref, the pixel driving circuit supplies a driving current to the pixels of each color, and the output terminal of the first amplifier 1 is connected to the first capacitor C1. The other end and the drive current calculation unit are connected to each other. In the present embodiment, in the drive current extraction circuit corresponding to the pixel drive circuit of each color, the amplification factor of the first amplifier 1 is the pixel drive current of the color so that the drive current of the pixel of each color is uniformly extracted. Inversely proportional to size. For example, the green pixel has the highest light emission efficiency, the green pixel has the smallest drive current, and the blue pixel has the lowest light emission efficiency, and thus the blue pixel has the largest drive current. Therefore, in the drive current extraction circuit corresponding to the green pixel drive circuit, the amplification factor of the first amplifier 1 is the largest, and in the drive current extraction circuit corresponding to the red pixel drive circuit, the amplification factor of the first amplifier 1. Then, in the drive current extraction circuit corresponding to the blue pixel drive circuit, the amplification factor of the first amplifier 1 is the smallest. As described above, the charging time required for the large driving current is shortened, the charging time required for the small driving current is appropriately lengthened, and finally the driving current of each color pixel is substantially equal to the charging time for the first capacitor C1. As a result, the finally obtained data becomes uniform.
図３に示す回路は、上述した駆動電流抽出装置の１つの選択的な実現方式である。図３に示すように、駆動電流抽出装置は、第１のコンデンサーＣ１に並列に接続される第１のスイッチＴ１をさらに備え、駆動電流計算ユニットは、第２の増幅器２、第２のスイッチＴ２、第３のスイッチＴ３、第２のコンデンサーＣ２及び第３のコンデンサーＣ３等を備える。第１の増幅器１の出力端は、第２のスイッチＴ２の一端及び第３のスイッチＴ３の一端にそれぞれ接続され、第２のスイッチＴ２の他端は、第２のコンデンサーＣ２の一端及び第２の増幅器２の第１の入力端にそれぞれ接続され、第２のコンデンサーＣ２の他端は接地され、第３のスイッチＴ３の他端は、第３のコンデンサーＣ３の一端及び第２の増幅器２の第２の入力端にそれぞれ接続され、第３のコンデンサーＣ３の他端は接地される。第２の増幅器２は、主に、第２のコンデンサーＣ２と第３のコンデンサーＣ３との電圧差の値を計算して増幅するものであり、全差分演算増幅器であることが好ましい。最後に、第２の増幅器２の出力端は、差分アナログ−デジタル変換器３に接続され、第２の増幅器２から出力されるアナログ信号を、後続で処理しやすいデジタル信号に変換する。
The circuit shown in FIG. 3 is one selective implementation of the drive current extraction device described above. As shown in FIG. 3, the drive current extraction device further includes a first switch T1 connected in parallel to the first capacitor C1, and the drive current calculation unit includes the
図４に示すように、画素駆動回路は、典型的な２Ｔ１Ｃ構造であり、即ち、スイッチトランジスタＴ５、駆動トランジスタＤＴＦＴ及び蓄積容量Ｃを備え、駆動トランジスタＤＴＦＴのドレイン電極は画素の駆動電流を供給し、第１の増幅器１の入力端は、駆動トランジスタＤＴＦＴのドレイン電極に接続される。タイミング制御を便利にするために、第１のスイッチＴ１、第２のスイッチＴ２及び第３のスイッチＴ３は、いずれもスイッチトランジスタ又は他の制御可能なアナログスイッチであってもよい。本実施例では、第１のスイッチＴ１、第２のスイッチＴ２及び第３のスイッチＴ３は、いずれもスイッチトランジスタであり、そして、第１のスイッチＴ１、第２のスイッチＴ２及び第３のスイッチＴ３を、タイミング制御装置にそれぞれ接続し、タイミング制御装置は、第１のスイッチＴ１、第２のスイッチＴ２及び第３のスイッチＴ３の開閉タイミングをそれぞれ制御するものである。 As shown in FIG. 4, the pixel driving circuit has a typical 2T1C structure, that is, includes a switch transistor T5, a driving transistor DTFT, and a storage capacitor C, and a drain electrode of the driving transistor DTFT supplies a driving current for the pixel. The input terminal of the first amplifier 1 is connected to the drain electrode of the drive transistor DTFT. For convenience of timing control, the first switch T1, the second switch T2, and the third switch T3 may all be switch transistors or other controllable analog switches. In the present embodiment, the first switch T1, the second switch T2, and the third switch T3 are all switch transistors, and the first switch T1, the second switch T2, and the third switch T3. Are respectively connected to the timing control device, and the timing control device controls the opening / closing timings of the first switch T1, the second switch T2, and the third switch T3, respectively.
本発明は、上述した画素駆動電流抽出装置により実現される抽出方法をさらに提供する。該画素駆動電流抽出方法は、主に、駆動電流抽出工程及び駆動電流計算工程を備える。本発明実施例に係る駆動電流抽出方法の主な改進の一つは、駆動電流抽出工程において、各色の画素駆動電流に対する増幅倍数が該色の画素駆動電流の大きさと反比例するところにあり、これによって、大きい駆動電流が必要する充電時間は短くなり、小さい駆動電流が必要する充電時間は適当に長くなり、最終に各色の画素駆動電流が第１のコンデンサーＣ１に対する充電時間はほぼ同じようになることにより、最後に得られるデータが均一になる。 The present invention further provides an extraction method realized by the above-described pixel drive current extraction device. The pixel drive current extraction method mainly includes a drive current extraction step and a drive current calculation step. One of the main improvements of the drive current extraction method according to the embodiment of the present invention is that, in the drive current extraction step, the amplification factor for the pixel drive current of each color is inversely proportional to the magnitude of the pixel drive current of the color. As a result, the charging time required for a large driving current is shortened, the charging time required for a small driving current is appropriately increased, and finally, the pixel driving current for each color is substantially the same as the charging time for the first capacitor C1. As a result, the finally obtained data becomes uniform.
本実施例では、図４に示す駆動電流抽出装置の駆動タイミングについては、具体的に、図５に示されており、以下、図４及び図５を組み合わせて各タイミングをそれぞれ説明する。 In this embodiment, the drive timing of the drive current extracting device shown in FIG. 4 is specifically shown in FIG. 5, and each timing will be described below in combination with FIG. 4 and FIG.
ステップＳ１では、タイミング制御装置は、高レベル信号を出力し、第１のスイッチＴ１、第２のスイッチＴ２及び第３のスイッチＴ３を導通して、第１の増幅器１の出力端の電圧を参照電圧Ｖｒｅｆにリセットし、
ステップＳ２では、タイミング制御装置の制御信号によって、第１のスイッチＴ１を切断して、第２のスイッチＴ２及び第３のスイッチＴ３が依然として導通され、この時、画素駆動回路４から流入される電流が第１のコンデンサーＣ１を充電し、第１のコンデンサーＣ１の両端の電量が時間に伴って線形増加するため、第１の増幅器１の出力端の電圧が時間に伴って線形変化し、
ステップＳ３では、タイミング制御装置の制御信号によって、第２のスイッチＴ２及び第３のスイッチＴ３を順に切断し、第２のコンデンサーＣ２及び第３のコンデンサーＣ３の電圧値を得て、ここで、第３のスイッチＴ３が導通される時間は、第２のスイッチＴ２が導通される時間より長いため、第３のコンデンサーＣ３に蓄積される電圧は、第２のコンデンサーＣ２に蓄積される電圧より多く、第２のコンデンサーＣ２及び第３のコンデンサーＣ３に蓄積される電圧を、全差分演算増幅器２の入力として、全差分演算増幅器２によって第２のコンデンサーＣ２と第３のコンデンサーＣ３との電圧差の値を計算して増幅する。
In step S1, the timing control device outputs a high level signal, conducts the first switch T1, the second switch T2, and the third switch T3, and refers to the voltage at the output terminal of the first amplifier 1. Reset to voltage Vref,
In step S2, the first switch T1 is disconnected by the control signal of the timing control device, and the second switch T2 and the third switch T3 are still conductive. At this time, the current flowing from the pixel driving circuit 4 Charges the first capacitor C1, and the electric energy at both ends of the first capacitor C1 increases linearly with time, so that the voltage at the output terminal of the first amplifier 1 changes linearly with time,
In step S3, the second switch T2 and the third switch T3 are sequentially disconnected by the control signal of the timing control device to obtain the voltage values of the second capacitor C2 and the third capacitor C3. Since the time when the third switch T3 is turned on is longer than the time when the second switch T2 is turned on, the voltage stored in the third capacitor C3 is more than the voltage stored in the second capacitor C2, The voltage accumulated in the second capacitor C2 and the third capacitor C3 is used as the input of the total difference
その中に、ステップＳ３の後に、
増幅された電圧差の値を差分アナログ−デジタル変換器３に入力して、必要されるデジタル信号を得るステップＳ４をさらに備える。
In it, after step S3,
Step S4 is further provided to input the amplified voltage difference value to the differential analog-to-
以上の実施例は、本発明を説明するものに過ぎず、本発明を限定するものではない。当業者は、本発明の精神及び範囲から逸脱しない場合に、様々な変化及び変形することができる。従って、等価の技術案はいずれも本発明の請求項の保護範囲に入る。 The above examples are merely illustrative of the invention and do not limit the invention. Various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, any equivalent technical solution falls within the protection scope of the claims of the present invention.
１ 第１の増幅器
２ 第２の増幅器
３ 差分アナログ−デジタル変換器
４ 画素駆動回路
DESCRIPTION OF SYMBOLS 1
Claims (13)
各色の画素駆動回路にそれぞれ対応する駆動電流抽出回路を備え、
各駆動電流抽出回路は、
画素駆動回路に接続され、画素駆動回路の駆動電流を増幅して電圧信号に変換する駆動電流増幅変換ユニットと、
前記駆動電流増幅変換ユニットに接続され、前記電圧信号により画素駆動電流を計算する駆動電流計算ユニットと、を備え、
各色の画素駆動回路に対応する駆動電流抽出回路においける駆動電流増幅変換ユニットの増幅倍数は、該色の画素駆動電流の大きさと反比例することを特徴とする画素駆動電流抽出装置。 A pixel drive current extraction device comprising:
A drive current extraction circuit corresponding to each color pixel drive circuit is provided,
Each drive current extraction circuit
A drive current amplification conversion unit connected to the pixel drive circuit and amplifying the drive current of the pixel drive circuit and converting it to a voltage signal;
A drive current calculation unit connected to the drive current amplification conversion unit and calculating a pixel drive current according to the voltage signal;
A pixel drive current extraction device, wherein an amplification factor of a drive current amplification conversion unit in a drive current extraction circuit corresponding to a pixel drive circuit of each color is inversely proportional to the magnitude of the pixel drive current of the color.
前記第１の増幅器は、第１の入力端が第１のコンデンサーの一端と、該駆動電流抽出回路に対応する画素駆動回路とにそれぞれ接続され、第２の入力端が参照電圧に接続され、
前記第１の増幅器の出力端は、第１のコンデンサーの他端及び駆動電流計算ユニットにそれぞれ接続され、
各色の画素駆動回路に対応する駆動電流抽出回路において、第１の増幅器の増幅倍数は、該色の画素駆動電流の大きさと反比例することを特徴とする請求項１に記載の画素駆動電流抽出装置。 The drive current amplification conversion unit includes a first amplifier and a first capacitor,
The first amplifier has a first input terminal connected to one end of the first capacitor and a pixel driving circuit corresponding to the driving current extraction circuit, and a second input terminal connected to a reference voltage,
The output terminal of the first amplifier is connected to the other end of the first capacitor and the drive current calculation unit, respectively.
2. The pixel driving current extracting device according to claim 1, wherein in the driving current extracting circuit corresponding to the pixel driving circuit of each color, the amplification factor of the first amplifier is inversely proportional to the magnitude of the pixel driving current of the color. .
前記赤、緑、青との三色の画素駆動回路の駆動電流抽出回路では、緑色の画素駆動回路に対応する駆動電流抽出回路において、第１の増幅器の増幅倍数が最も大きく、青色画素駆動回路に対応する駆動電流抽出回路において第１の増幅器の増幅倍数が最も小さいことを特徴とする請求項２又は３に記載の画素駆動電流抽出装置。 The pixel drive current extraction device has drive current extraction circuits respectively corresponding to pixel drive circuits of three colors of red, green, and blue,
In the drive current extraction circuit of the three-color pixel drive circuit of red, green, and blue, the blue pixel drive circuit has the largest amplification factor of the first amplifier in the drive current extraction circuit corresponding to the green pixel drive circuit. 4. The pixel drive current extraction device according to claim 2, wherein the amplification factor of the first amplifier is the smallest in the drive current extraction circuit corresponding to.
前記第１の増幅器の出力端は、前記第２のスイッチの一端及び第３のスイッチの一端にそれぞれ接続され、
前記第２のスイッチの他端は、第２のコンデンサーの一端及び第２の増幅器の第１の入力端にそれぞれ接続され、前記第２のコンデンサーの他端が接地され、
前記第３のスイッチの他端は、第３のコンデンサーの一端及び第２の増幅器の第２の入力端にそれぞれ接続され、前記第３のコンデンサーの他端が接地されることを特徴とする請求項５に記載の画素駆動電流抽出装置。 The drive current calculation unit includes a second amplifier, a second switch, a third switch, a second capacitor, and a third capacitor,
The output terminal of the first amplifier is connected to one end of the second switch and one end of a third switch, respectively.
The other end of the second switch is connected to one end of a second capacitor and a first input end of a second amplifier, and the other end of the second capacitor is grounded.
The other end of the third switch is connected to one end of a third capacitor and a second input end of the second amplifier, respectively, and the other end of the third capacitor is grounded. Item 6. The pixel drive current extraction device according to Item 5.
前記第２の増幅器は、全差分演算増幅器であって、第２のコンデンサーと第３のコンデンサーとの電圧差の値を計算して増幅するものであることを特徴とする請求項６〜９のいずれか１項に記載の画素駆動電流抽出装置。 The first amplifier is an operational amplifier that converts an input current into a voltage,
10. The second amplifier according to claim 6, wherein the second amplifier is a total difference operational amplifier, and calculates and amplifies a voltage difference value between the second capacitor and the third capacitor. The pixel drive current extracting device according to any one of the above.
駆動電流を抽出して、画素駆動回路の駆動電流を増幅して電圧信号に変換するステップと、
駆動電流を計算して、前記電圧信号を分圧してから差分及び増幅演算をして画素駆動電流を得るステップと、を備え、
各色の画素駆動電流に対する増幅倍数は、該色の画素駆動電流の大きさと反比例することを特徴とする画素駆動電流抽出方法。 A pixel drive current extraction method comprising:
Extracting the drive current, amplifying the drive current of the pixel drive circuit and converting it to a voltage signal;
Calculating a drive current, dividing the voltage signal, and performing a difference and amplification operation to obtain a pixel drive current, and
A method for extracting a pixel driving current, wherein an amplification factor for the pixel driving current of each color is inversely proportional to the magnitude of the pixel driving current of the color.
第１のスイッチを切断し、画素駆動回路から流入される電流が第１のコンデンサーを充電する（Ｓ２）と、
第２のスイッチ及び第３のスイッチを順に切断して、第２のコンデンサー及び第３のコンデンサーの電圧値を得て、第２の増幅器によって第２のコンデンサーと第３のコンデンサーとの電圧差の値を計算して増幅する（Ｓ３）と、をさらに備えることを特徴とする請求項１１に記載の画素駆動電流抽出方法。 Conducting the first switch, the second switch and the third switch to reset the voltage at the output terminal of the first amplifier to the reference voltage (S1);
When the first switch is disconnected and the current flowing from the pixel driving circuit charges the first capacitor (S2),
The second switch and the third switch are cut in order to obtain the voltage values of the second capacitor and the third capacitor, and the voltage difference between the second capacitor and the third capacitor is obtained by the second amplifier. The pixel drive current extraction method according to claim 11, further comprising: calculating and amplifying the value (S3).
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